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40t單流中間包控流裝置的優化配置

Optimization of flow control devices in a 40-t single strand tundish

  • 摘要: 采用水模型和工業驗證的方法針對40 t單流中間包的控流裝置進行優化配置研究.通過對單獨湍流抑制器控流裝置、湍流抑制器+下擋墻組合控流裝置、湍流抑制器+下擋墻+上擋墻組合控流裝置的研究表明,下擋墻在改善鋼液流動形態和減少中間包內死區方面所起的作用大于上擋墻.平均停留時間隨下擋墻與長水口的距離增加呈先增大后減小的趨勢.確定了單流中間包以湍流抑制器+下擋墻的優化組合形式,死區比例由原來的25.9%降低到了13.6%.通過系統取樣分析發現優化后中間包內T.O和N含量大幅降低,正常坯中的大型夾雜物質量分數也由原來的8.4×10-7降低到3.2×10-7.

     

    Abstract: An optimization of flow control "devices in a 40-t single strand continuous casting tundish was carried out by water modeling experiments and industrial experiments. Three cases were considered during the experiments, i. e, tundish equipped with a turbulence inhibitor, tundish equipped with a turbulence inhibitor and dams, and tundish equipped with a turbulence inhibitor, dams and weirs. The results show that the dams play a much more important role than the weirs in improving the fluid flow characteristics and decreasing the dead volume fraction in the tundish. The average residence time increases firstly and reduces afterward with increasing distance between the dam and nozzle. The tundish equipped with a turbulence inhibitor and dams is the optimized according to these results, and the dead volume fraction reduces to 13.6% from 25.9%. The results of industrial application shows that the T. O and N contents reduce greatly and the mass fraction of macro inclusions in normal slabs reduced to 3.2×10-7 from 8.4 × 10-7.

     

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